always before the beer is opened,test whether it had been opened and the lid replaced.You can do this with your thumb.
Since some stupid daughter from hell tried to give me mcheled new beer,I must test whether the lid (kifuniko) is firm before the waiter opens.
If they note you are not very careful,they open elsewhere (kwa couter) then spike it with mchele and replace the lid,when they come to your table,they open very quickly and leave you only to wake up next day at 11.
"You're not supposed to be so blind with patriotism that you can't face reality. Wrong is wrong, no matter who says it". Malcolm X